CN113758878A - Sedimentation water mist interference suppression method based on equivalent optical thickness - Google Patents
Sedimentation water mist interference suppression method based on equivalent optical thickness Download PDFInfo
- Publication number
- CN113758878A CN113758878A CN202111153055.2A CN202111153055A CN113758878A CN 113758878 A CN113758878 A CN 113758878A CN 202111153055 A CN202111153055 A CN 202111153055A CN 113758878 A CN113758878 A CN 113758878A
- Authority
- CN
- China
- Prior art keywords
- polarization
- light
- polarized light
- iii
- polarization state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N2021/216—Polarisation-affecting properties using circular polarised light
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a settlement water mist interference suppression method based on equivalent optical thickness, which belongs to the field of polarization transmission experiment tests. According to the method, while the influence of attached water mist is inhibited, the influence of the optical glass attached water mist on the polarization transmission characteristic result in different mist filling time can be obtained in a mode of simultaneously detecting a vertical path and an equivalent path, so that the accuracy of the atmospheric-sea mist environment polarization transmission characteristic experiment is improved, and a new test method is provided for the research of polarization detection transmission under a multilayer medium.
Description
Technical Field
The invention belongs to the field of polarization transmission experiment tests, and particularly relates to a settling water mist interference suppression method based on equivalent optical thickness.
Background
In natural environments, there are various multi-layer medium environments, such as an atmospheric-sea fog environment in coastal areas, an inland atmospheric-haze environment, an atmospheric-dust environment, and the like. The multilayer medium environment makes airborne vertical detection difficult to increase remarkably. Therefore, the research on the vertical detection of the multilayer medium has important significance for sea and land transportation, rescue and investigation.
However, because airborne outdoor experiments are difficult, long in time consumption and high in cost, indoor multilayer medium experiments are generally adopted to simulate real environments outside fields. Indoor experimental research shows that polarized light has good penetrability in a complex medium relative to unpolarized light, and can carry richer information, so polarized light is mostly adopted for polarization detection experiments. However, in an indoor experiment, it is found that a layer of water mist is attached to an optical window in the vertical direction due to water mist settlement, so that the parameters such as the polarization state and the like in an experimental result are interfered, and the result accuracy is influenced, so that the research on the settled water mist interference suppression method based on the equivalent optical thickness is of great significance.
Therefore, in order to inhibit the influence of the settled water mist of the optical window on the indoor experiment of the multilayer medium environment simulation device and measure the influence, a settled water mist interference inhibition method based on the equivalent optical thickness is urgently needed.
Disclosure of Invention
The invention aims to provide a settled water mist interference suppression method based on equivalent optical thickness, aiming at solving the problem that a layer of water mist is attached to optical glass on a vertical path due to medium settlement in a polarization transmission experiment of a multilayer medium simulation device to influence an experiment result, and aiming at researching and suppressing the influence of the water mist attached to an optical window due to the water mist settlement on the experiment.
The technical scheme adopted by the invention for realizing the purpose is as follows: the method for inhibiting the interference of the settled water mist based on the equivalent optical thickness is characterized in that an environment simulation device applied by the method is divided into an upper layer and a lower layer, the structures of the upper layer and the lower layer are consistent and are cubes, and the method comprises the following steps:
step one, early preparation:
the method comprises the following steps that firstly, a polarization emitting system I and a polarization receiving system I are arranged on the same light beam transmission light path along the vertical direction, light path calibration is carried out, light emitted by the polarization emitting system I sequentially passes through an upper layer and a lower layer of an environment simulation device and then enters the polarization receiving system I, and a polarization emitting system II and a polarization receiving system II are arranged on the same light beam transmission light path along the horizontal direction, light path calibration is carried out, and light emitted by the polarization emitting system II passes through the lower layer of the environment simulation device and then enters the polarization receiving system II; along the horizontal direction, the polarized transmitting system III and the polarized receiving system III are arranged on the same light beam transmission light path, and light path calibration is carried out, so that light emitted by the polarized transmitting system III passes through the upper layer of the environment simulation device and then enters the polarized receiving system III;
secondly, according to experimental requirements, the polarization emission system I and the polarization emission system II are configured to emit one of horizontal linearly polarized light, vertical linearly polarized light, + 45-degree linearly polarized light, -45-degree linearly polarized light, left-handed circularly polarized light or right-handed circularly polarized light;
the polarized emission system III is configured to emit polarized light in any polarization state;
step two, opening a polarization emission system II in the empty box, wherein the polarization emission system II emits one of horizontal linearly polarized light, vertical linearly polarized light, linearly polarized light with +45 degrees, linearly polarized light with-45 degrees, left-handed circularly polarized light or right-handed circularly polarized light; the optical power and the polarization state in the horizontal direction of the transparent box received by the polarization receiving system II are called as a first optical power and a first polarization state; filling fog into the lower layer of the environment simulation device until the indication value of an optical power meter II in the polarization receiving system II is stable and does not change any more, stopping filling fog to form a sea fog environment simulation layer, and at the moment, the optical power and the polarization state in the horizontal direction of the sea fog penetrating environment received by the polarization receiving system II are called as a second optical power and a second polarization state;
emptying all the sea fog of the lower sea fog environment simulation layer, wiping optical glass on an optical glass window arranged at the bottom of the environment simulation device, and changing the environment simulation device into an empty box state; adjusting a polarization transmitting system I to enable a polarization receiving system I to obtain a first optical power and a first polarization state; adjusting the polarization transmitting system III to enable the polarization receiving system III to obtain a second optical power and a second polarization state;
step four, simultaneously filling fog into the lower layer and filling atmospheric aerosol into the upper layer of the environment simulation device to respectively form a sea fog environment simulation layer and an atmospheric environment simulation layer, wherein the fog filling time and the fog filling process are completely consistent with those in the step two, and the fog filling is carried out until the indication of the optical power meter I in the polarization receiving system I is stable and does not change any more, namely the optical power and the polarization state in the vertical direction of the double-layer environment received by the polarization receiving system I are called as a third optical power and a third polarization state; the optical power and the polarization state in the horizontal direction of the atmosphere environment received by the third polarization receiving system are called as fourth optical power and a fourth polarization state;
and fifthly, comparing the third optical power with the fourth optical power, and comparing the third polarization state with the fourth polarization state to obtain the influence of the water mist attached to the optical glass on the experimental result, wherein the fourth optical power and the fourth polarization state are the optical power and the polarization state for inhibiting the influence of the water mist attached to the optical glass.
Further, the polarization emitting system III is composed of a laser III, an attenuation sheet III, a polarizing sheet III, a liquid crystal variable phase retarder I and a liquid crystal variable phase retarder II which are sequentially arranged along the propagation direction of light.
Further, in the step one, the process that the polarized light emitting system iii is configured to emit polarized light in any polarization state is as follows: with the horizontal direction as the reference, the polarization direction of the polarizing plate III in the polarization emission system III is set to be 0 degree in the horizontal direction, the included angle between the fast axis of the liquid crystal variable phase retarder I and the horizontal direction is 45 degrees, and the included angle between the fast axis of the liquid crystal variable phase retarder II and the horizontal direction is 0 degree, then the following steps are carried out:
wherein M isPA Muller matrix of a polaroid III; mLCVR1A Muller matrix of a liquid crystal variable phase delayer I; mLCVR2A Muller matrix of a liquid crystal variable phase delayer II; theta is the angle of the polarizing direction of the polarizing plate III, namely 0 degree; alpha is an included angle of a fast axis of the liquid crystal variable phase delayer I and the horizontal direction, namely 45 degrees; beta is the included angle between the fast axis of the liquid crystal variable phase delayer II and the horizontal direction, namely 0 degree; delta1The phase delay of the liquid crystal variable phase delayer I is adopted; delta2The phase delay of the liquid crystal variable phase delayer II is shown;
the stokes vector relation before and after the polarized light passes through the upper atmospheric environment simulation layer of the environment simulation device in the horizontal direction is as follows:
wherein Sin＝[Iin Qin Uin Vin]And Sout＝[Iout Qout Uout Vout]TStokes vectors, I, of incident and emergent light, respectivelyinIs the total light intensity, Q, of the incident lightinIs the difference between the light intensity of the incident light horizontal and vertical linear polarized light, UinIs the difference between the incident light intensity of 45-degree and 135-degree linearly polarized light, VinIs the difference between the right-handed and left-handed circularly polarized light intensities of the incident light; i isoutIs the total light intensity of emergent light, QoutIs the difference between the light intensity of the horizontally and vertically polarized light of the emergent light, UoutIs the difference between the light intensity of the linearly polarized light with 45 degrees and 135 degrees of the emergent light, VoutThe emergent light is the difference of the light intensity of right-handed circularly polarized light and left-handed circularly polarized light;
the phase delay delta of the liquid crystal variable phase delayer I is controlled by adjusting the voltage through an external controller1And phase delay delta of liquid crystal variable phase delayer II2And carrying out polarization modulation to obtain polarized light in any polarization state.
Through the design scheme, the invention can bring the following beneficial effects: the invention provides a settling water mist interference suppression method based on equivalent optical thickness, aiming at the defect that in an indoor experiment for researching the polarization transmission characteristic of a multilayer medium in the vertical direction, a layer of water mist is formed on optical glass due to water mist settling, and the polarization characteristic experiment result is influenced. The method obtains the polarization state of emergent light of a lower sea fog environment simulation layer of the horizontal environment simulation device through a polarization receiving system, utilizes a double-liquid crystal variable phase retarder to modulate the polarization state to ensure that the polarization state of incident light passing through an upper atmospheric environment simulation layer of the horizontal environment simulation device in the horizontal direction is equal to the polarization state of emergent light passing through the lower sea fog environment simulation layer of the horizontal environment simulation device, simultaneously opens lower fog filling and upper air sol filling layers to enable the test effect of one upper atmospheric environment simulation layer of the horizontal environment simulation device to be equivalent to the test effect of two layers of the vertical atmosphere-sea fog simulation device, enables the method to inhibit the influence of attached water fog, and simultaneously obtains the influence of the attached water fog of optical glass on the polarization transmission characteristic result at different fog filling time through a mode of simultaneously detecting a vertical path and an equivalent path, a new test method is provided for the research of polarization detection transmission under a multilayer medium.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to the right, and in which:
fig. 1 is a schematic structural diagram of a system adopted by the settled water mist interference suppression method based on equivalent optical thickness.
The respective symbols in the figure are as follows: 1 is a polarization emitting system I, 101 is a laser I, 102 is an attenuation plate I, 103 is a polarizing plate I, 104 is a quarter-wave plate I, 2 is a polarization emitting system II, 201 is a laser II, 202 is an attenuation plate II, 203 is a polarizing plate II, 204 is a quarter-wave plate II, 3 is a polarization emitting system III, 301 is a laser III, 302 is an attenuation plate III, 303 is a polarizing plate III, 304 is a liquid crystal variable phase retarder I, 305 is a liquid crystal variable phase retarder II, 4 is a polarization receiving system I, 401 is a non-polarization splitting prism I, 402 is an optical power meter I, 403 is a polarization state meter I, 5 is a polarization receiving system II, 501 is a non-polarization splitting prism II, 502 is an optical power meter II, 503 is a polarization state meter II, 6 is a polarization receiving system III, 601 is a non-polarization splitting prism III, 602 is an optical power meter III, 603 is a polarization state meter III, 7 is an environment simulation device, 701 is a first optical glass window, 702 is a second optical glass window, 703 is a third optical glass window, 704 is a fourth optical glass window, 705 is a fifth optical glass window, 706 is a sixth optical glass window, 707 is a seventh optical glass window, 708 is a sea mist particle generator, 709 is an atmospheric aerosol generator, and 8 is a data processing system.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the present invention is not limited by the following examples, and specific embodiments can be determined according to the technical solutions and practical situations of the present invention. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention. In the description of the present invention, it is to be understood that the terms "first", "second", "third", "fourth", "fifth", "sixth" and "seventh" are used for descriptive purposes only and that the features defined as "first", "second", "third", "fourth", "fifth", "sixth" and "seventh" do not denote any order, quantity or importance, but rather are used to distinguish one element from another. In the present invention, for convenience of description, the description of the relative positional relationship of the respective members is described based on the layout pattern of the drawings, and the positional relationship of the upper, lower, left, right, etc. is determined based on the layout direction of the drawings.
As shown in fig. 1, the system adopted by the method for suppressing interference of settled water mist based on equivalent optical thickness provided by the invention comprises: the device comprises a polarized transmitting system I1, a polarized transmitting system II 2, a polarized transmitting system III 3, a polarized receiving system I4, a polarized receiving system II 5, a polarized receiving system III 6, an environment simulation device 7 and a data processing system 8.
The polarization emitting system I1 is positioned below the environment simulation device 7 and is opposite to the first optical glass window 701, and the polarization emitting system I1 is used for emitting polarized light for the upper layer environment and the lower layer environment of the environment simulation device 7 arranged in the vertical direction; the polarization emitting system I1 is composed of a laser I101, an attenuation sheet I102, a polarizing sheet I103 and a quarter-wave plate I104 which are sequentially arranged along the propagation direction of light, according to experimental requirements, the laser I101 can be used for emitting visible light or near infrared light, and the attenuation sheet I102 is used for changing the light power of the laser reaching the polarization receiving system I4; the polarizer I103 and the quarter-wave plate I104 are adjusted to obtain polarized light with different polarization states.
The polarization emitting system II 2 is positioned on one side, provided with a fourth optical glass window 704, of the lower layer of the environment simulation device 7, the polarization emitting system II 2 is opposite to the fourth optical glass window 704, the polarization emitting system II 2 is used for emitting polarized light for a sea fog environment simulation layer of the environment simulation device 7 in the horizontal direction, the polarization emitting system II 2 comprises a laser II 201, an attenuation sheet II 202, a polarizing sheet II 203 and a quarter-wave plate II 204 which are sequentially arranged along the propagation direction of the light, according to experimental requirements, the laser II 201 can be used for emitting visible light or near infrared light, and the attenuation sheet II 202 is used for changing the light power of the laser reaching the polarization receiving system II 5; the polarizing plate II 203 and the quarter-wave plate II 204 are adjusted to obtain polarized light with different polarization states.
The polarization emitting system III 3 is positioned on one side, provided with a sixth optical glass window 706, of the upper layer of the environment simulation device 7, the polarization emitting system III 3 is opposite to the sixth optical glass window 706, the polarization emitting system III 3 is used for emitting polarized light for an atmospheric environment simulation layer of the environment simulation device 7 in the horizontal direction, the polarization emitting system III 3 comprises a laser III 301, an attenuation sheet III 302, a polarizing sheet III 303, a liquid crystal variable phase retarder I304 and a liquid crystal variable phase retarder II 305 which are sequentially arranged along the propagation direction of the light, the laser III 301 can replace visible light and near infrared wave bands, and the laser III emits visible light or near infrared light according to experimental requirements; compared with a conventional mechanical rotation polarization modulator, the polarization degree adjusting precision of the polarization state modulating device modulated by the double liquid crystal variable phase delayers can reach one thousandth, and the polarization degree adjusting device has the advantages of large adjustable range, no mechanical adjustment, dynamic continuous adjustment and the like, and can quickly, accurately and stably obtain polarized light in any polarization state. Because the polarized light of the complicated polarization state is obtained by the polarized light emitting system III 3, the polarization state is adjusted by selecting the double-liquid-crystal variable phase retarder due to the requirements of experiments on the adjusting speed and the adjusting precision. The attenuation sheet III 302 is used for changing the optical power of the laser reaching the polarization receiving system III 6; polarized light in any polarization state can be obtained by adjusting the polarizing plate III 303, the liquid crystal variable phase retarder I304 and the liquid crystal variable phase retarder II 305, wherein the liquid crystal variable phase retarder I304 and the liquid crystal variable phase retarder II 305 can be tested by selecting LCC1413-A (350 nm-700 nm), LCC1413-B (650 nm-1050 nm) and LCC1413-C (1050 nm-1700 nm) of Thorlabs company according to wave bands.
The polarization receiving system I4 is arranged above the environment simulation device 7, the polarization receiving system I4 is opposite to the third optical glass window 703, the polarization receiving system I4 comprises a non-polarization beam splitter prism I401, an optical power meter I402 and a polarization state measuring instrument I403, the optical power meter I402 is arranged on a transmission light path of the non-polarization beam splitter prism I401, and the polarization state measuring instrument I403 is arranged on a reflection light path of the non-polarization beam splitter prism I401; the polarization receiving system I4 is used for measuring the polarization state and the optical power of the polarized light received by the polarization receiving system I and passing through the two layers of environments of the vertical direction environment simulation device 7, and is connected to the data processing system 8 through a data line for data analysis and processing.
The polarization receiving system II 5 is arranged on the right side of a fifth optical glass window 705 of the environment simulation device 7, the polarization receiving system II 5 comprises a non-polarization beam splitter prism II 501, an optical power meter II 502 and a polarization state measuring instrument II 503, the optical power meter II 502 is arranged on a reflection optical path of the non-polarization beam splitter prism II 501, the polarization state measuring instrument II 503 is arranged on a transmission optical path of the non-polarization beam splitter prism II 502, and the polarization receiving system II 5 is used for measuring the polarization state and the optical power of the polarization light which passes through the horizontal sea fog simulation system layer and is received by the polarization receiving system II 5 and is connected to the data processing system 8 through a data line to perform analysis processing of data and the like.
The polarization receiving system III 6 is arranged at the right side of a sixth optical glass window 706 of the environment simulation device 7, the polarization receiving system III 6 comprises a non-polarization beam splitter prism III 601, an optical power meter III 602 and a polarization state measuring instrument III 603, the optical power meter III 602 is arranged on a reflection optical path of the non-polarization beam splitter prism III 601, the polarization state measuring instrument III 603 is arranged on a transmission optical path of the non-polarization beam splitter prism III 601, and the polarization receiving system III 6 is used for measuring the polarization state and the optical power of the polarized light which passes through the horizontal atmosphere simulation system layer and is received by the polarization receiving system III 6 and is connected to the data processing system 8 through a data line for data analysis processing.
The environment simulation device 7 is a square stainless steel box body with an upper layer and a lower layer, an optical glass window is arranged at the corresponding position of the top of the upper layer, the middle partition plate and the center of the bottom of the lower layer, the optical glass window is respectively a third optical glass window 703, a second optical glass window 702 and a first optical glass window 701, and the channel is called as a first channel; the corresponding positions of the left and right side walls of the upper layer and the lower layer of the environment simulation device 7 are respectively provided with an optical glass window, the lower layer is respectively provided with a fourth optical glass window 704 and a fifth optical glass window 705, and the channel is called as a second channel; the upper layers are a sixth optical glass window 706 and a sixth optical glass window 707, respectively, and the path is called a third path. The first light beam enters a first channel through a first optical glass window 701, exits from a third optical glass window 703 and enters a non-polarization beam splitter I401 of a polarization receiving system I4; the second light beam enters a second channel through a fourth optical glass window 704, exits from a fifth optical glass window 705 and enters a non-polarization beam splitter prism II 502 of a polarization receiving system II 5; the third light beam enters the second channel through a sixth optical glass window 706, exits from a seventh optical glass window 707, and enters a non-polarization beam splitter prism iii 601 of the polarization receiving system iii 6. The lower layer is filled with sea fog particles by a sea fog particle generator 708 to simulate the sea fog environment, and the upper layer is filled with aerosol by an atmospheric aerosol generator 709 to simulate the atmospheric environment.
The data processing system 8 is connected with the optical power meter I402, the polarization state measuring instrument I403, the optical power meter II 502, the polarization state measuring instrument II 503, the optical power meter III 602 and the polarization state measuring instrument III 603 through data lines, and analyzes and processes the optical power and the polarization state data recorded by the data processing system.
The optical glass used for the first optical glass window 701, the second optical glass window 702, the third optical glass window 703, the fourth optical glass window 704, the fifth optical glass window 705, the sixth optical glass window 706 and the seventh optical glass window 707 is K9 glass, and the light transmission range is 330nm to 2100 nm. The K9 glass has high hardness, good laser damage resistance and good transmittance for visible light bands and near infrared bands.
The fourth optical glass window 704, the fifth optical glass window 705, the sixth optical glass window 706 and the seventh optical glass window 707 have waterproof frames. The waterproof frame can prevent the side wall water mist from flowing to the fourth optical glass window 704, the fifth optical glass window 705, the sixth optical glass window 706 and the seventh optical glass window 707, and the waterproof frame has a certain depth, and the water mist sedimentation has no influence on the waterproof frame, so that the accuracy of the multi-layer medium environment polarization transmission characteristic experiment is improved,
with reference to fig. 1, the process of performing the polarization transmission experiment without the influence of the water mist attached to the optical glass by the system comprises the following steps:
step one, early preparation:
firstly, a polarized transmitting system I1, a polarized transmitting system II 2 and a polarized transmitting system III 3 are respectively placed on corresponding light beam transmission light paths with a polarized receiving system I4, a polarized receiving system II 5 and a polarized receiving system III 6 which respectively correspond to the polarized transmitting system I1, the polarized transmitting system II 2 and the polarized transmitting system III 3, and light path calibration is carried out;
secondly, configuring the polarization emission system I1 and the polarization emission system II 2 into one of horizontal linearly polarized light, vertical linearly polarized light, + 45-degree linearly polarized light, -45-degree linearly polarized light, left-handed or right-handed circularly polarized light according to experimental needs;
third, the polarization direction of the polarizing plate III 303 of the polarization emission system III 3 is set to be 0 degree in the horizontal direction, the included angle between the fast axis of the liquid crystal variable phase retarder I304 and the horizontal direction is 45 degrees, and the included angle between the fast axis of the liquid crystal variable phase retarder II 305 and the horizontal direction is 0 degree, so that polarized light in any polarization state can be obtained by placing the polarizing plate III, and the related formula is as follows:
wherein M isPA Muller matrix of a polaroid III 303; mLCVR1A Muller matrix of a liquid crystal variable phase delayer I304; mLCVR2A Muller matrix of a liquid crystal variable phase delayer II 305; theta is the angle of the polarization direction of the polarizing plate III 303, namely 0 degree; alpha is an included angle of the fast axis of the liquid crystal variable phase delayer I304 and the horizontal direction, namely 45 degrees; beta is the included angle between the fast axis of the liquid crystal variable phase delayer II 305 and the horizontal direction, namely 0 degree; delta1The phase delay of the liquid crystal variable phase delayer I304 is shown; delta2Is the phase delay of the liquid crystal variable phase delayer II 305;
wherein Sin＝[Iin Qin Uin Vin]、Sout＝[Iout Qout Uout Vout]TStokes vectors, I, of incident and emergent light, respectivelyinIs the total light intensity, Q, of the incident lightinIs the difference between the light intensity of the incident light horizontal and vertical linear polarized light, UinIs the difference between the incident light intensity of 45-degree and 135-degree linearly polarized light, VinIs the difference between the right-handed and left-handed circularly polarized light intensities of the incident light; i isoutIs the total light intensity of emergent light, QoutIs the difference between the light intensity of the horizontally and vertically polarized light of the emergent light, UoutIs the difference between the light intensity of the linearly polarized light with 45 degrees and 135 degrees of the emergent light, VoutThe emergent light is the difference of the light intensity of right-handed circularly polarized light and left-handed circularly polarized light;
the phase delay delta of the liquid crystal variable phase delayer I304 is controlled by adjusting the voltage through an external controller1And phase retardation delta of liquid crystal variable phase retarder II 3052Carrying out polarization modulation to obtain polarized light in any polarization state;
the Stokes vector S of emergent light passing through the lower sea fog environment simulation layer of the environment simulation device 7 in the horizontal direction is obtained by the second polarization receiving system 5outdownBy the above formula:
Sout＝[Iout Qout Uout Vout]T＝MLCVR2·MLCVR1·MP·Sin
wherein the Stokes vector SinThe Stokes vector of the incident light is the same as that of the lower sea fog environment simulation layer, and the S is modulated by a double-liquid crystal variable phase retarderout＝SoutdownThe polarization state of incident light on the upper atmospheric environment simulation layer can be equal to the polarization state of emergent light on the lower sea fog environment simulation layer, so that the optical thickness of the upper atmospheric environment simulation layer of the horizontal direction environment simulation device is equivalent to the optical thickness of the two layers of the vertical direction environment simulation device, and the method is also suitable for the environment simulation device which is divided into n layers and added withThe same can be done by adding the polarization state of the incident light to the n layer so that the polarization state of the incident light of the n layer is equal to that of the emergent light of the n-1 layer, namely Snout＝Sn-1outdownSo that the optical thickness of the nth layer in the horizontal direction is equivalent to the optical thickness of the total n-1 layers in the vertical direction below the nth layer;
and step two, opening a laser II 201 in an empty box, and adjusting an attenuation plate II 202, a polaroid II 203 and a quarter-wave plate II 204 to enable a polarization emission system II 2 to emit one of horizontal linearly polarized light, vertical linearly polarized light, linear polarized light of +45 degrees, linear polarized light of-45 degrees, left-handed or right-handed circularly polarized light. The optical power and polarization state in the horizontal direction of the transparent box received by the polarization receiving system ii 5 are referred to as a first optical power and a first polarization state. Starting the lower-layer sea fog particle self-generator 708 for fog filling, stirring by a built-in fan in the whole fog filling process, ensuring air circulation to ensure that the sea fog concentration is uniform, and ensuring fog filling until the indication number of the optical power meter II 502 is stable and does not change any more, wherein the optical power and the polarization state in the horizontal direction of the sea fog penetrating environment received by the polarization receiving system II 5 are called as a second optical power and a second polarization state;
and step three, emptying all the sea fog of the lower sea fog environment layer, and wiping the bottom optical glass to dry so that the bottom optical glass is in an empty box state. The method comprises the following steps of starting a laser I101, adjusting an attenuation plate I102, a polarizing plate I103 and a quarter-wave plate I104, and enabling an optical power meter I402 and a polarization state measuring instrument I403 to obtain a first optical power and a first polarization state; turning on the laser III 301, adjusting the attenuation plate III 302, and adjusting the phase delay delta of the liquid crystal variable phase retarder I304 by controlling the voltage1And phase retardation delta of liquid crystal variable phase retarder II 3052Carrying out polarization modulation to enable a polarization receiving system III 6 to obtain a second optical power and a second polarization state;
and step four, the sea fog particle generator 708 and the atmospheric aerosol generator 709 are started simultaneously, and the fog filling time and the fog filling process are completely consistent with those in the step two, so that the control experiment variables are ensured. During the whole process of mist filling and sol filling, a built-in fan is used for stirring, so that air is circulated, the uniform sea mist concentration is ensured, and the mist filling is not changed until the indication number of the optical power meter I402 is stable. The optical power and the polarization state in the vertical direction of the double-layer environment received by the polarization receiving system I4 are called as a third optical power and a third polarization state; the optical power and the polarization state in the horizontal direction of the atmosphere environment received by the third polarization receiving system are called as fourth optical power and a fourth polarization state;
and fifthly, comparing the third optical power, the third polarization state, the fourth optical power and the fourth polarization state through the data processing system 8 to obtain the influence of the water mist attached to the optical glass on the experimental result, wherein the fourth optical power and the fourth polarization state are the optical power and the polarization state for inhibiting the influence of the water mist attached to the optical glass. The influence of the water mist attached to the optical glass at different time on the polarization transmission experiment can be measured by filling mist at intervals, the method can be used for measuring the influence of the water mist attached to more layers of the medium optical glass by increasing the number and the types of the medium layers, and the like, and the repeated description is omitted.
Claims (3)
1. The method for inhibiting the interference of the settled water mist based on the equivalent optical thickness is characterized in that an environment simulation device (7) applied by the method is divided into an upper layer and a lower layer, and the upper layer and the lower layer are both cubic bodies in consistent structure, and the method comprises the following steps:
step one, early preparation:
arranging a polarized transmitting system I (1) and a polarized receiving system I (4) on the same light beam transmission light path along the vertical direction, calibrating the light path, enabling light emitted by the polarized transmitting system I (1) to sequentially pass through an upper layer and a lower layer of an environment simulation device (7) and then to be emitted into the polarized receiving system I (4), arranging a polarized transmitting system II (2) and a polarized receiving system II (5) on the same light beam transmission light path along the horizontal direction, calibrating the light path, and enabling light emitted by the polarized transmitting system II (2) to pass through the lower layer of the environment simulation device (7) and then to be emitted into the polarized receiving system II (5); along the horizontal direction, the polarized transmitting system III (3) and the polarized receiving system III (6) are arranged on the same light beam transmission light path, and light path calibration is carried out, so that light emitted by the polarized transmitting system III (3) passes through the upper layer of the environment simulation device (7) and then enters the polarized receiving system III (6);
secondly, according to experimental requirements, the polarization emission system I (1) and the polarization emission system II (2) are configured to emit one of horizontal linearly polarized light, vertical linearly polarized light, + 45-degree linearly polarized light, -45-degree linearly polarized light, left-handed circularly polarized light or right-handed circularly polarized light;
the polarized emission system III (3) is configured to emit polarized light in any polarization state;
step two, opening a polarization emission system II (2) in an empty box, wherein the polarization emission system II (2) emits one of horizontal linearly polarized light, vertical linearly polarized light, + 45-degree linearly polarized light, -45-degree linearly polarized light, left-handed circularly polarized light or right-handed circularly polarized light; the optical power and the polarization state in the horizontal direction of the transparent box received by the polarization receiving system II (5) are called as a first optical power and a first polarization state; filling fog into the lower layer of the environment simulation device (7) until the indication number of an optical power meter II (502) in the polarization receiving system II (5) is stable and does not change any more, stopping filling fog to form a sea fog environment simulation layer, and at the moment, the optical power and the polarization state in the horizontal direction of the sea fog environment received by the polarization receiving system II (5) are called as a second optical power and a second polarization state;
step three, emptying all the sea fog of the lower sea fog environment simulation layer, wiping an optical glass window arranged at the bottom of the environment simulation device (7) to dry, and changing the environment simulation device (7) into an empty box state; adjusting a polarization transmitting system I (1) to enable a polarization receiving system I (4) to obtain a first optical power and a first polarization state; adjusting the polarized transmitting system III (3) to enable the polarized receiving system III (6) to obtain a second optical power and a second polarization state;
step four, simultaneously filling fog into the lower layer and atmosphere aerosol into the upper layer of the environment simulation device (7) to respectively form a sea fog environment simulation layer and an atmosphere environment simulation layer, wherein the fog filling time and the fog filling process are completely consistent with those in the step two, and the fog filling is carried out until the indication number of an optical power meter I (402) in the polarization receiving system I (4) is stable and does not change, and the optical power and the polarization state in the vertical direction of the double-layer environment received by the polarization receiving system I (4) are called as a third optical power and a third polarization state; the optical power and the polarization state in the horizontal direction of the atmosphere environment received by the third polarization receiving system (6) are called as fourth optical power and a fourth polarization state;
and fifthly, comparing the third optical power with the fourth optical power, and comparing the third polarization state with the fourth polarization state to obtain the influence of the water mist attached to the optical glass on the experimental result, wherein the fourth optical power and the fourth polarization state are the optical power and the polarization state for inhibiting the influence of the water mist attached to the optical glass.
2. The settled water mist disturbance suppression method based on the equivalent optical thickness as claimed in claim 1, wherein the polarized emission system III (3) is composed of a laser III (301), an attenuator III (302), a polarizing plate III (303), a liquid crystal variable phase retarder I (304) and a liquid crystal variable phase retarder II (305) which are sequentially arranged along the propagation direction of light.
3. The method for suppressing the interference of the settled water mist based on the equivalent optical thickness as claimed in claim 2, wherein in the step one, the process that the polarized light emitting system III (3) is configured to emit the polarized light in any polarization state is as follows: when the polarization direction of the polarizing plate III (303) in the polarization emission system III (3) is set to be 0 degree in the horizontal direction, an included angle between the fast axis of the liquid crystal variable phase retarder I (304) and the horizontal direction is 45 degrees, and an included angle between the fast axis of the liquid crystal variable phase retarder II (305) and the horizontal direction is 0 degree by taking the horizontal direction as a reference, the following steps are provided:
wherein M isPA Muller matrix of polarizer III (303); mLCVR1A Muller matrix which is a liquid crystal variable phase retarder I (304); mLCVR2A Muller matrix which is a liquid crystal variable phase retarder II (305);theta is the polarization direction angle of the polarizing plate III (303), namely 0 degree; alpha is an included angle of a fast axis of the liquid crystal variable phase delayer I (304) and the horizontal direction, namely 45 degrees; beta is the included angle between the fast axis of the liquid crystal variable phase delayer II (305) and the horizontal direction, namely 0 degree; delta1Is the phase delay of a liquid crystal variable phase delayer I (304); delta2Is the phase delay of a liquid crystal variable phase delayer II (305);
the Stokes vector relational expression of the polarized light passing through the environment simulation device (7) in the horizontal direction before and after the upper atmosphere environment simulation layer is as follows:
wherein Sin＝[Iin Qin Uin Vin]And Sout＝[Iout Qout Uout Vout]TStokes vectors, I, of incident and emergent light, respectivelyinIs the total light intensity, Q, of the incident lightinIs the difference between the light intensity of the incident light horizontal and vertical linear polarized light, UinIs the difference between the incident light intensity of 45-degree and 135-degree linearly polarized light, VinIs the difference between the right-handed and left-handed circularly polarized light intensities of the incident light; i isoutIs the total light intensity of emergent light, QoutIs the difference between the light intensity of the horizontally and vertically polarized light of the emergent light, UoutIs the difference between the light intensity of the linearly polarized light with 45 degrees and 135 degrees of the emergent light, VoutThe emergent light is the difference of the light intensity of right-handed circularly polarized light and left-handed circularly polarized light;
the phase delay delta of the liquid crystal variable phase delayer I (304) is controlled by adjusting the voltage through an external controller1And phase retardation delta of liquid crystal variable phase retarder II (305)2And carrying out polarization modulation to obtain polarized light in any polarization state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153055.2A CN113758878B (en) | 2021-09-29 | 2021-09-29 | Sedimentation water mist interference suppression method based on equivalent optical thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111153055.2A CN113758878B (en) | 2021-09-29 | 2021-09-29 | Sedimentation water mist interference suppression method based on equivalent optical thickness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113758878A true CN113758878A (en) | 2021-12-07 |
| CN113758878B CN113758878B (en) | 2022-05-17 |
Family
ID=78798293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111153055.2A Active CN113758878B (en) | 2021-09-29 | 2021-09-29 | Sedimentation water mist interference suppression method based on equivalent optical thickness |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113758878B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116559089A (en) * | 2023-07-06 | 2023-08-08 | 长春理工大学 | Multilayer medium polarization characteristic acquisition device and method |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH571750A5 (en) * | 1974-09-10 | 1976-01-15 | Nohmi Bosai Kogyo Co Ltd | Photoelectricccc aerosol or smoke detector - second photo cell receives reflected light from prism surface to compensate for contamination |
| US6392749B1 (en) * | 1997-09-22 | 2002-05-21 | Candela Instruments | High speed optical profilometer for measuring surface height variation |
| US6665078B1 (en) * | 1997-09-22 | 2003-12-16 | Candela Instruments | System and method for simultaneously measuring thin film layer thickness, reflectivity, roughness, surface profile and magnetic pattern in thin film magnetic disks and silicon wafers |
| US20140247357A1 (en) * | 2011-11-30 | 2014-09-04 | Hiroyoshi Sekiguchi | Attached matter detector, and attached matter detection method |
| CN104283617A (en) * | 2014-09-17 | 2015-01-14 | 长春理工大学 | Polarization laser beam generation method based on liquid crystal variable phase delayer |
| US20150142263A1 (en) * | 2012-07-13 | 2015-05-21 | Ricoh Company, Ltd. | Imaging unit, attached matter detector, control system for vehicle, and vehicle |
| CN104865224A (en) * | 2015-06-05 | 2015-08-26 | 长春理工大学 | Division-of-amplitude type measurement method of patterns in scattering characteristic Mueller matrix for smoke medium |
| CN105806808A (en) * | 2016-03-25 | 2016-07-27 | 中国人民解放军理工大学 | Device and method for automatic measurement of natural atmospheric aerosol Mueller matrix |
| CN106018290A (en) * | 2016-07-04 | 2016-10-12 | 长春理工大学 | Dual-waveband active-polarization target identification system for observing sea fog environment |
| US20170363472A1 (en) * | 2014-11-16 | 2017-12-21 | B.G. Negev Technologies & Applications Ltd. At Ben-Gurion University | MULTI-SPECTRAL POLARlMETRIC VARIABLE MULTI-SPECTRAL POLARlMETRIC VARIABLE |
| CN107764399A (en) * | 2017-11-16 | 2018-03-06 | 长春理工大学 | The verification method of non-homogeneous smoky environment polarization transfer characteristics experiment and emulation |
| CN107941711A (en) * | 2017-11-16 | 2018-04-20 | 长春理工大学 | Multilayer dielectricity polarization transfer characteristics experiment test and the verification method of Computer Simulation |
| CN207439548U (en) * | 2017-11-16 | 2018-06-01 | 长春理工大学 | A kind of non-homogeneous smog medium polarization transfer characteristics test system |
| US20190204217A1 (en) * | 2017-12-29 | 2019-07-04 | Palo Alto Research Center Incorporated | Measuring path delay through a liquid-crystal variable retarder at non-uniform retardance intervals |
| JP2020030372A (en) * | 2018-08-24 | 2020-02-27 | オリンパス株式会社 | Polarization observation device |
| CN110927071A (en) * | 2019-12-16 | 2020-03-27 | 长春理工大学 | Method for verifying polarization transmission characteristic test and simulation of sea fog environment under influence of illumination |
| CN110987816A (en) * | 2019-12-16 | 2020-04-10 | 长春理工大学 | Multilayer sea fog environment active polarization characteristic test system under influence of solar illumination |
| CN111141390A (en) * | 2020-02-20 | 2020-05-12 | 长春理工大学 | Dual-waveband polarization characteristic testing system based on sea fog multilayer medium environment |
| CN113176185A (en) * | 2021-04-23 | 2021-07-27 | 长春理工大学 | Polarization measurement system of smoke particle Mueller matrix |
-
2021
- 2021-09-29 CN CN202111153055.2A patent/CN113758878B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH571750A5 (en) * | 1974-09-10 | 1976-01-15 | Nohmi Bosai Kogyo Co Ltd | Photoelectricccc aerosol or smoke detector - second photo cell receives reflected light from prism surface to compensate for contamination |
| US6392749B1 (en) * | 1997-09-22 | 2002-05-21 | Candela Instruments | High speed optical profilometer for measuring surface height variation |
| US6665078B1 (en) * | 1997-09-22 | 2003-12-16 | Candela Instruments | System and method for simultaneously measuring thin film layer thickness, reflectivity, roughness, surface profile and magnetic pattern in thin film magnetic disks and silicon wafers |
| US20140247357A1 (en) * | 2011-11-30 | 2014-09-04 | Hiroyoshi Sekiguchi | Attached matter detector, and attached matter detection method |
| US20150142263A1 (en) * | 2012-07-13 | 2015-05-21 | Ricoh Company, Ltd. | Imaging unit, attached matter detector, control system for vehicle, and vehicle |
| CN104283617A (en) * | 2014-09-17 | 2015-01-14 | 长春理工大学 | Polarization laser beam generation method based on liquid crystal variable phase delayer |
| US20170363472A1 (en) * | 2014-11-16 | 2017-12-21 | B.G. Negev Technologies & Applications Ltd. At Ben-Gurion University | MULTI-SPECTRAL POLARlMETRIC VARIABLE MULTI-SPECTRAL POLARlMETRIC VARIABLE |
| CN104865224A (en) * | 2015-06-05 | 2015-08-26 | 长春理工大学 | Division-of-amplitude type measurement method of patterns in scattering characteristic Mueller matrix for smoke medium |
| CN105806808A (en) * | 2016-03-25 | 2016-07-27 | 中国人民解放军理工大学 | Device and method for automatic measurement of natural atmospheric aerosol Mueller matrix |
| CN106018290A (en) * | 2016-07-04 | 2016-10-12 | 长春理工大学 | Dual-waveband active-polarization target identification system for observing sea fog environment |
| CN107764399A (en) * | 2017-11-16 | 2018-03-06 | 长春理工大学 | The verification method of non-homogeneous smoky environment polarization transfer characteristics experiment and emulation |
| CN107941711A (en) * | 2017-11-16 | 2018-04-20 | 长春理工大学 | Multilayer dielectricity polarization transfer characteristics experiment test and the verification method of Computer Simulation |
| CN207439548U (en) * | 2017-11-16 | 2018-06-01 | 长春理工大学 | A kind of non-homogeneous smog medium polarization transfer characteristics test system |
| US20190204217A1 (en) * | 2017-12-29 | 2019-07-04 | Palo Alto Research Center Incorporated | Measuring path delay through a liquid-crystal variable retarder at non-uniform retardance intervals |
| JP2020030372A (en) * | 2018-08-24 | 2020-02-27 | オリンパス株式会社 | Polarization observation device |
| CN110927071A (en) * | 2019-12-16 | 2020-03-27 | 长春理工大学 | Method for verifying polarization transmission characteristic test and simulation of sea fog environment under influence of illumination |
| CN110987816A (en) * | 2019-12-16 | 2020-04-10 | 长春理工大学 | Multilayer sea fog environment active polarization characteristic test system under influence of solar illumination |
| CN111141390A (en) * | 2020-02-20 | 2020-05-12 | 长春理工大学 | Dual-waveband polarization characteristic testing system based on sea fog multilayer medium environment |
| CN113176185A (en) * | 2021-04-23 | 2021-07-27 | 长春理工大学 | Polarization measurement system of smoke particle Mueller matrix |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116559089A (en) * | 2023-07-06 | 2023-08-08 | 长春理工大学 | Multilayer medium polarization characteristic acquisition device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113758878B (en) | 2022-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113702296B (en) | Water mist adhesion inhibiting system in atmosphere-sea mist simulation device | |
| CN113758878B (en) | Sedimentation water mist interference suppression method based on equivalent optical thickness | |
| CN113176185B (en) | Polarization measurement system of smoke particle Mueller matrix | |
| CN110987816B (en) | Multilayer sea fog environment active polarization characteristic test system under influence of solar illumination | |
| CN105716756B (en) | A kind of device for accurately measuring of optical material microstress spatial distribution | |
| EP0200978B1 (en) | Static interferometric ellipsometer | |
| CN105115701B (en) | The device and method of optical mirror slip transmitance in precise measurement high power laser light environment | |
| CN104931812A (en) | Electro-optical crystal electro-optical factor measure method and device | |
| Marusii et al. | Scattering of light by nematic liquid crystals in cells with a finite energy of the anchoring of the director to the walls | |
| CN110161295A (en) | A kind of probe and its Method of Adjustment of reflection type optical fiber electric-field sensor | |
| Abbate et al. | The direct determination of the temperature dependence of the refractive index of liquids and solids | |
| CN103849850A (en) | Film thickness monitoring method of optical film and irregular film system optical film thickness instrument | |
| CN207439548U (en) | A kind of non-homogeneous smog medium polarization transfer characteristics test system | |
| CN113358604B (en) | Oblique incidence type spectral reflection differential measurement device and method | |
| Lo et al. | An approach for measuring the ellipsometric parameters of isotropic and anisotropic thin films using the Stokes parameter method | |
| Suárez-Bermejo et al. | Analysis of the errors in polarimetry with full Poincaré beams | |
| Hemming | Helium film profile on a gold and a quartz substrate | |
| CN103267576B (en) | Device and method for light wave polarization state high-speed static measurement | |
| Zhou et al. | Calibration of a collinear backscattering Mueller matrix imaging system | |
| CN212540119U (en) | Microscopic angle-resolved transmitted light phase information characterization system | |
| SU1163161A1 (en) | Device for measuring phase shift of light wave at multiple-distributed total internal reflection | |
| SU623145A1 (en) | Method of non-destructive checking of dielectric material mechanical anisotropy | |
| SU1130778A1 (en) | Mach-zender interferometer-based device for measuring optical parameters of transparent media | |
| Dlugunovich et al. | Evaluation of Optical Anisotropy of Nanoporous Alumina Films by Stokes-Polarimetry and Matrix Coherence Methods | |
| Jie et al. | Simulation of partially coherent optical atmospheric turbulent transmission based on LC-SLM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |